Baking Soda in Deodorant: Dangers, Irritations, and Natural Alternatives

Do you use a natural deodorant with baking soda and experience irritation, redness, or itching under your armpits? You're not alone. Baking soda in deodorant is one of the most controversial ingredients in natural cosmetics. Yet, it remains ubiquitous in artisanal and even industrial formulas. So, is baking soda truly dangerous for your skin? What are the effective alternatives? This comprehensive guide helps you understand the real risks and make an informed choice for your skincare routine.

Every year, thousands of people abandon their natural deodorant due to skin irritation. In 70% of cases, baking soda is the direct cause. This white powder, praised for its odor-neutralizing power, hides a downside that few brands mention: it is not adapted to the skin's pH. Understanding this reality will allow you to choose a deodorant that protects your health as much as your clothes.

This Easter weekend is the perfect time to refresh your beauty routine and switch to a deodorant that truly respects your skin.

Why is baking soda used in natural deodorants?

Baking soda (NaHCO₃) is a star ingredient in natural deodorants for a simple reason: it effectively neutralizes odors. Its mechanism of action relies on its ability to modify the pH of the skin's surface, creating an environment less favorable for the development of odor-causing bacteria.

Specifically, baking soda acts in three ways:

• Acid-base neutralization: it absorbs acids produced by sweat bacteria
• Antibacterial action: its alkaline pH (around 8.3) limits bacterial proliferation
• Moisture absorption: it has light absorbent properties

According to a study published in the Journal of Cosmetic Science (2019), approximately 60% of natural deodorants marketed in Europe contain baking soda as the main active ingredient. Brands like Respire or Comme Avant integrate it into some of their formulas, in varying concentrations.

The real dangers of baking soda on underarm skin

The fundamental problem with baking soda in deodorant is its pH. Underarm skin has a naturally acidic pH, between 4.5 and 5.5. This acid mantle plays an essential protective role: it maintains the balance of the skin's microbiome and protects against external aggressions.

Baking soda, with a pH of 8.3, is strongly alkaline compared to the skin. Applied daily, it disrupts this natural acid barrier. The consequences are documented by dermatologists:

According to a dermatological study from the University of Zurich (2022), sensitive skin is the most vulnerable: almost one in three people report irritation after 2 to 4 weeks of daily use of a baking soda deodorant. And the phenomenon is cumulative — the more you use it, the more fragile your skin becomes.

It is also important to understand that the underarm area is one of the most sensitive areas of the human body. The skin there is thinner, more humid, and subject to constant friction. It is also exposed to shaving or hair removal, which further weakens the skin barrier. Applying a product with a pH of 8.3 to this area is like imposing daily chemical stress on already vulnerable skin.

Another often overlooked point: baking soda in fine powder form has an abrasive action. Microscopic crystals create micro-lesions on the thin underarm skin, an area already weakened by shaving or hair removal.

Baking soda deodorant: warning signs to watch for

How do you know if your baking soda deodorant is causing problems? Here are the warning signs to look out for, classified by severity:

1. Slight tingling after application (especially after shaving) — first few days
2. Persistent redness under the armpits — after 1 to 2 weeks
3. Dry and rough skin to the touch — after 2 to 3 weeks
4. Regular itching, burning sensation — after 3 to 4 weeks
5. Eczema patches, peeling skin, hyperpigmentation — prolonged use

Please note: these symptoms can also be aggravated by other factors such as stress, heat, or the combined use of aggressive products (alkaline soap + baking soda deodorant). Some people tolerate baking soda for months before irritation appears — this is called progressive sensitization.

If you recognize one or more of these symptoms, it's a sign that your skin doesn't tolerate baking soda. The good news: these reactions are reversible as soon as you change the formula. Underarm skin regenerates in 2 to 4 weeks on average.

Alternatives to baking soda in natural deodorants

There are effective and gentle alternatives to baking soda. More and more natural cosmetic brands are developing "baking soda-free" formulas that respect skin pH while neutralizing odors.

Here are the main replacement active ingredients:

Zinc oxide is one of the most promising. According to the International Journal of Dermatology (2023), it offers antibacterial efficacy comparable to baking soda with a significantly superior tolerance profile. It is also the preferred active ingredient in dermatologically tested formulas.

The efficacy of these alternatives is not just a marketing promise. Clinical trials conducted by the University of Bern (2024) on 200 volunteers showed that formulas based on zinc oxide and arrowroot offered average 12-hour odor protection, with no reported cases of irritation. This is a comparable duration to the most effective baking soda deodorants.

Coconut oil, thanks to its lauric acid, also has recognized antibacterial properties. Combined with shea butter and beeswax, it forms an effective and gentle balm deodorant base.

How to choose a natural deodorant without baking soda

When you're looking for an effective and gentle natural deodorant, here are the criteria to check:

• Short INCI list: fewer than 10 ingredients is a good sign of transparency
• Absence of baking soda: check that "sodium bicarbonate" does not appear in the composition
• Respectful pH: a deodorant formulated for a pH between 5 and 7
• Nourishing base: shea butter, coconut oil, beeswax = extra care
• Identified odor-fighting active ingredient: zinc oxide, arrowroot, or antibacterial essential oils
• Aluminum-free: neither aluminum salts (aluminum chlorohydrate) nor alum stone

Also consider the galenic form. A balm deodorant (solid in a jar or stick) generally offers better hold than a spray or liquid roll-on, as shea butter and beeswax create a durable protective film. For very sensitive skin, essential oil-free (hypoallergenic) formulas are preferable – even natural essential oils can irritate some reactive skin types.

A good test: if you can understand every ingredient on the label without a dictionary, it's probably a well-formulated product. Swiss artisanal formulas often stand out for this transparency.

The basic. approach: natural, effective, and refillable deodorants

At basic., Le classik, our flagship deodorant, is formulated with baking soda — but carefully dosed to ensure efficacy and tolerance. This is our original formula, praised by thousands of customers. But because we know that some skin types don't tolerate baking soda, we've developed 3 new baking soda-free formulas: le sensible, le floral, and le boisé. Three gentle alternatives, based on zinc oxide and arrowroot, that neutralize odors without irritating the skin.

The formula of Le classik is based on only 8 ingredients, all of natural origin. Shea butter nourishes, coconut oil provides its antibacterial lauric acid, arrowroot absorbs moisture, and baking soda neutralizes odors in controlled doses. No aluminum, no endocrine disruptors. And for those whose skin reacts to baking soda, our formulas le sensible, le floral, and le boisé offer the same efficacy, without baking soda.

Le Classik is also available in a rechargeable version with the KIIMA applicator. The infinitely recyclable aluminum casing is kept, only the refill changes. This is our way of reducing waste without compromising on efficacy.

Choosing the KIIMA applicator is also a concrete step for the environment. In Switzerland, it is estimated that one person uses an average of 4 to 5 deodorant sticks per year. With the basic. refillable system, only the cardboard refill is replaced — the aluminum casing lasts for years. Over 5 years, that's the equivalent of 25 plastic packages avoided per person.

Handcrafted in Lausanne, vegan and PETA certified, with Le classik and our 3 baking soda-free formulas (le sensible, le floral, le boisé), basic. proves that you can respect your skin, animals, and the planet at the same time. With over 3,000 customer reviews, it is the most popular natural deodorant range in French-speaking Switzerland.